Hertbeat polling at a default time interval on ESRS

Hi.

I'd like to know the interval time of the heartbeat communication of "Device client on SP".

I have already checked the regular outbount communication interval time of "Gateway Clients".

But didn't get any clue about "Device client on SP", newer verson of the "Gateway Clients".

(Please refer to docu37730_EMC-Secure-Remote-Support-Gateway-for-Windows-2.28-Operations-Guide.pdf, on 22p.)

Q1. Do you have the document about Device client on SP?

Q2. How many interval seconds for the heartbeat communication of Device client on SP?

Thanks.